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Customers can lower the price by adding the special discount code SCSSEONOV18 , which gives you £18 off when you spend more than £60. That squeezes the price of your bubbly down to just £1.50 a bottle.

Martin said: "But the T&Cs say the £18-off discount can’t be on booze, so you’ll need to buy at least £33 worth of normal groceries to make it work [to get you over the £60 total spend]. Then you’re effectively getting six bottles for £1.50.

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"Stock is meant to be decent, but usually there’s heavy demand. In past incarnations of this deal Sainsbury’s has substituted it for a more costly version if it runs out.

"So select ‘no substitutions’ in your preferences to stop this happening (if you don’t, you can always reject delivery). Delivery is £1 to £7, or you can collect in store for free. And of course, please be Drinkaware."